<html>

<head>
 <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>

<body>
    <div>
        发送验证码:
    </div>
    <input type="number">
    <button>点击发送验证码</button>
</body>
<script>
    var buttonDom = document.querySelector("button");
    var time=15;
    buttonDom.onclick = function () {
        buttonDom.disabled=true;
        console.log("触发点击事件，发送验证码");
        buttonDom.innerText=time;
        var interval=setInterval(function (){
            time--;
            console.log(time);
            buttonDom.innerText=time;
     if(time==0){
            buttonDom.disabled=false;
buttonDom.innerText="点击发送验证码";
time=15;
clearInterval(interval);
        }       
        },1000);
        
    };
</script>

</html>